Honestly, maybe four of the 221s, and a few others. I always succumb to the value prop and buy more than I need. They’re just much more elegant, and SO much easier to use than the twisty caps. And I like having extras of this kind of thing on hand. It’s such a good feeling when something comes up, and you’re like, “I have a thing for that!” (Like, I have a random old replacement window latch that’s been sitting in a toolbox for 20 years, and I was just messing with the latch that just broke on the bathroom window, and the light of realization shone down from on high)